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Allowance for Credit Losses - Summary of Impaired Loans (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
Financing Receivable, Impaired [Line Items]  
With an allowance recorded, Recorded Investment $ 0
With an allowance recorded, Unpaid Principal Balance 0
With an allowance recorded, Related Allowance 20
Total, Recorded Investment 7,313
Total, Unpaid Principal Balance 7,370
Total, Related Allowance 20
With no related allowance recorded, Average Recorded Investment 7,376
With no related allowance recorded, Interest Recognized 293
With an allowance recorded, Average Recorded Investment 23
With an allowance recorded, Interest Recognized 1
Total, Average Recorded Investment 7,399
Total, Interest Recognized 294
Agriculture Loans [Member]  
Financing Receivable, Impaired [Line Items]  
With no related allowance recorded, Recorded Investment 300
With no related allowance recorded, Unpaid Principal Balance 300
With an allowance recorded, Recorded Investment 0
With an allowance recorded, Unpaid Principal Balance 0
With an allowance recorded, Related Allowance 0
Total, Recorded Investment 300
Total, Unpaid Principal Balance 300
Total, Related Allowance 0
With no related allowance recorded, Average Recorded Investment 200
With no related allowance recorded, Interest Recognized 9
With an allowance recorded, Average Recorded Investment 0
With an allowance recorded, Interest Recognized 0
Commercial Loans [Member]  
Financing Receivable, Impaired [Line Items]  
With no related allowance recorded, Recorded Investment 35
With no related allowance recorded, Unpaid Principal Balance 55
With an allowance recorded, Recorded Investment 20
With an allowance recorded, Unpaid Principal Balance 20
With an allowance recorded, Related Allowance 20
Total, Recorded Investment 55
Total, Unpaid Principal Balance 75
Total, Related Allowance 20
With no related allowance recorded, Average Recorded Investment 39
With no related allowance recorded, Interest Recognized 0
With an allowance recorded, Average Recorded Investment 23
With an allowance recorded, Interest Recognized 1
Commercial Real Estate Loans [Member]  
Financing Receivable, Impaired [Line Items]  
With no related allowance recorded, Recorded Investment 2,306
With no related allowance recorded, Unpaid Principal Balance 2,312
With an allowance recorded, Recorded Investment 0
With an allowance recorded, Unpaid Principal Balance 0
With an allowance recorded, Related Allowance 0
Total, Recorded Investment 2,306
Total, Unpaid Principal Balance 2,312
Total, Related Allowance 0
With no related allowance recorded, Average Recorded Investment 2,365
With no related allowance recorded, Interest Recognized 125
With an allowance recorded, Average Recorded Investment 0
With an allowance recorded, Interest Recognized 0
Residential Real Estate Loans [Member]  
Financing Receivable, Impaired [Line Items]  
With no related allowance recorded, Recorded Investment 4,652
With no related allowance recorded, Unpaid Principal Balance 4,683
With an allowance recorded, Recorded Investment 0
With an allowance recorded, Unpaid Principal Balance 0
With an allowance recorded, Related Allowance 0
Total, Recorded Investment 4,652
Total, Unpaid Principal Balance 4,683
Total, Related Allowance 0
With no related allowance recorded, Average Recorded Investment 4,772
With no related allowance recorded, Interest Recognized 159
With an allowance recorded, Average Recorded Investment 0
With an allowance recorded, Interest Recognized 0
Consumer Loans [Member]  
Financing Receivable, Impaired [Line Items]  
With no related allowance recorded, Recorded Investment 0
With no related allowance recorded, Unpaid Principal Balance 0
With an allowance recorded, Recorded Investment 0
With an allowance recorded, Unpaid Principal Balance 0
With an allowance recorded, Related Allowance 0
Total, Recorded Investment 0
Total, Unpaid Principal Balance 0
Total, Related Allowance 0
With no related allowance recorded, Average Recorded Investment 0
With no related allowance recorded, Interest Recognized 0
With an allowance recorded, Average Recorded Investment 0
With an allowance recorded, Interest Recognized 0
Municipal Loans [Member]  
Financing Receivable, Impaired [Line Items]  
With no related allowance recorded, Recorded Investment 0
With no related allowance recorded, Unpaid Principal Balance 0
With an allowance recorded, Recorded Investment 0
With an allowance recorded, Unpaid Principal Balance 0
With an allowance recorded, Related Allowance 0
Total, Recorded Investment 0
Total, Unpaid Principal Balance 0
Total, Related Allowance 0
With no related allowance recorded, Average Recorded Investment 0
With no related allowance recorded, Interest Recognized 0
With an allowance recorded, Average Recorded Investment 0
With an allowance recorded, Interest Recognized $ 0